Article of manufacture.



To all whom it mdy concern.-

"UNITED gems 1 oFrIoE.

JOSEPH AJSHINN, OF PITTSBURG, PENNSYIJVANIA, ASSIGNOR TO FIREPROOF YoRKa BeitknoW-nthatl, JOSEPH A. SH'I'NN, a

7 citizenof the United States, and a residentof Pittsburg, in the countyof Allegheny and.

State of Pennsylvania, have invented a certain new and useful Improved Article of Manufacture, of which the following is a specification.

This invention relates to a new composition for use in various lines, but is particularly adapted for use as fireproofing material and for electrical work on accountof its high fireproof qualities and non-conducting qualities and lows ecific gravity. My new. materia is made by mixing about ninety-two to ninety-five per cent. of finely powderedashes resulting from the combus- -tion of anthracite coal and from five to eight per cent. of lime, also powdered in form, and

after a small quantity of water is added, the

. amount being just sufiicibnt to moisten the mass, so that it Will adhere'together by a pressure of from three to four thousand pounds per square inch, in theform. in which it is toe used, I subject the material to the action of saturated steam undera pressure of from one hundred and fifty to one hundred and I seventy-five pounds per square inch and allow it to remain until the lime becomes firmly set by the action of the heat and moisture contained in the steam.

The new material has the following characteristics: It can be cut or sawed or bored with an auger, and nails can be driven into it without cracking it. It has considerably greater tensile strength than that of lime and sand whenunited, is practically a non-conduc tor of electricity, and is a fine non-conductor of heat. It Willstand a high degree of heat without disintegrating and is therefore a fine material for use in fireproofing buildings. It is light in weight compared to sand and lime mixtures and will not absorb moisture to so great a degree. this renders it of special value, as it may be used to a great extent in the building arts without artificial coloring. It'will stand a compression force of about five thousand pounds to the square inch before crushing ARTICLE OF M NUF CTURE;

v Specification of- Lettei-s Patent. A plicatienfiled April 9,1:506, sesame; 810,761 (s amm- Its natural color is gray, and

MATERIALS COMPANY A CORPORATION OF NEW Patented March 5, 1907.

- and i has certain amount of elasticity, which is an im ortant factor in making 1t of use in the buil ing arts.

The above facts as -to its qualities will I show that it is not the same material as would result fromIa-n ordinary mixture of ashes and lime in the same proportions without the process of heating. The proportions maybe changed from those given to some extent'without changing its good-qualities'to any great extent; but I. find that the less lime I use, so long as Luse enou h to act as a binder, the less the product wil cost. The moist steam heat permeates the entire mass, and therefore I do not add any more moisture in assembling the mixture than is absolutely required .to form it and leave the'hot moist steam to set the lime in a practically calcined condition.

Having thus described myinvention, What I claim as new, and desire to secure by Letters Patent, is-

1.,Theherein-described composition consisting of anthracite-coal ashes about ninetytwo parts and lime eight parts set by moist heat as described. Y p

-2. The herein-described composition consisting of anthracite-coal ashes and a binding material .of lime set by steam heat under a New York and State of New York, this 19thday of March, A. 1906 a JOSEPH A. sHINN.

Witnesses:

CLARENCE L. Wnsrco'rr, E. C. SIMONSON.

. 9Q- Signed at New York city, in the county of 

